220 35571 <49ce026b-dafa-40e6-8ff9-c7a3fa1c8305@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Myriachan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Rotational shift operator Date: Mon, 27 Nov 2017 12:59:40 -0800 (PST) Lines: 73 Approved: news@gmane.org Message-ID: <49ce026b-dafa-40e6-8ff9-c7a3fa1c8305@isocpp.org> References: <69593098-e2cc-487e-bd14-9001b27aa7c1@isocpp.org> <2006943.7FOg79mAd9@tjmaciei-mobl1> <26ae3548-1c54-4a64-8cd7-14958bf44b21@isocpp.org> <25193448.keueTqNGZF@tjmaciei-mobl1> <9b5b0f16-9e7b-4390-9422-897fb4506d3e@gmail.com> <8007a252-3ee9-4cc7-ae90-f46621189df0@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_26442_1938004936.1511816380533" X-Trace: blaine.gmane.org 1511816386 17286 195.159.176.226 (27 Nov 2017 20:59:46 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 27 Nov 2017 20:59:46 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDKLT4PURQHRBPPZ6HIAKGQED6T4CPQ@isocpp.org Mon Nov 27 21:59:42 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f71.google.com ([209.85.213.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eJQV5-0003ok-DJ for gclcip-std-proposals@m.gmane.org; Mon, 27 Nov 2017 21:59:35 +0100 Original-Received: by mail-vk0-f71.google.com with SMTP id p80sf16988784vkd.21 for ; Mon, 27 Nov 2017 12:59:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=GdtK5PAvKwTNwb4hqy/31wb2Q5y1R5mdq8JX6AlBgyU=; b=aCtpMa0yRlphlZ6486y0AkAQqyzIp17TF7/cezIT8N4gNo6BgrWsKtkt7m/nq3zXbp MNgcPvTeEru/A3TEs6YQCNZoGuHjsp1bWv1Z6jlqIiNs5NT1E29TvtJT7ymnKZGUSgbj Yh4R8lJvC+oPbDrWkM68xx/TMqy3pWcRwRmGC2MKrnMINd9g3Sl3h4e+fsgV6aCUEqct iBBnTaWTjag2p2OitjAt0NrkHdxGUw4v7G9jMIIg08TqB5wlnrJozTaQu5jYDUf3dzTc WWhKqJMpwxwkGUsNx2+SIGTpawgq/9OBoomYxbq1oklh+lsx4jtQ0EEqDLnUCKIvcceY I5Eg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=GdtK5PAvKwTNwb4hqy/31wb2Q5y1R5mdq8JX6AlBgyU=; b=qlljU4tU78BmgemEHNf8YJYLH8YjnGf8bNlra6Civ5W8k/JZqSgQef6LTEx37QFoCD VY7nL0EBBd0r8zZg6/GyzJnvQ3znP898h+Y8eCGO7Ag+su4fe/bxhWn8qkzSaAPsDksn Tun8XA8L01TsTMXOPpAteQfoZZa50MJ6UYFRnvUM4NeGqu6hmqlw1M8Yyg+XCP1cBmjC wmadtzB8YFw1x0WwpKAoNqM7xLvmUntyLPTpnPDN3g/+1wtAfJKd3hVwPZuap4HGOkFU HMw+/toOxsZVfYrfpOzahuxmJOGsAu3vjRsfPXbkwg8agNxXfgXQJCzczKdAP1xI1q10 Ybzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=GdtK5PAvKwTNwb4hqy/31wb2Q5y1R5mdq8JX6AlBgyU=; b=RcnpQyI44fJzZdgYKCjPTZb0tBpMKodvUfatfyE72CpKjtUEr0w1t1/IT9gnw+ab/+ kpRVSesOs0YkP8SWJEW8t+hnyJzjm1HRE8MY4S7xR2R4ydf2zCbJq2mVHfEGcm/Puczz rx0vDOIPs+7hTiWeoV9kb7O/fP7zuzy+1KQpvk6MFEYre4/GnsT/KIzvmG8GKamh1dbQ c0tu6N+SOnQfazoSZNP50jGbFcfC/M9esL8CNpRAnWUFN56GbrBqNUQssE9H0nWP9u08 zyxQhU3ydZLkY6ZcpToszSgMsObgqmtTxhVwuRs5IujXXiTOuMWttfkSABA+dsLhkCS9 /QcA== X-Gm-Message-State: AJaThX4ayLaVyv0OFG1tVNjQEOrq8zr3cla6GRGMjcC+3GedjpSM5fJz 72jkuS5IK2PWixmIBUqIx+RubA== X-Google-Smtp-Source: AGs4zMYzUocFhAtJkBHirvJIglOOoVzz+AcxSBe6oid1uUawVTzi6sZjDKVi4jmh8uM0gAd5JBFcgQ== X-Received: by 10.176.85.158 with SMTP id v30mr20132369uaa.0.1511816382692; Mon, 27 Nov 2017 12:59:42 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.176.85.201 with SMTP id w9ls4546684uaa.13.gmail; Mon, 27 Nov 2017 12:59:41 -0800 (PST) X-Received: by 10.31.14.193 with SMTP id 184mr913704vko.14.1511816381189; Mon, 27 Nov 2017 12:59:41 -0800 (PST) In-Reply-To: X-Original-Sender: myriachan@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:35571 Archived-At: ------=_Part_26442_1938004936.1511816380533 Content-Type: multipart/alternative; boundary="----=_Part_26443_22813391.1511816380533" ------=_Part_26443_22813391.1511816380533 Content-Type: text/plain; charset="UTF-8" On Saturday, November 25, 2017 at 12:46:36 PM UTC-8, David Brown wrote: > > Rotations are rare - they only turn up in a few niche types of code, such > as > cryptography algorithms. And usually such code is so complicated and > requires such time and thought to understand, that any time spend > understanding a rotation operator or function is negligible. > > I work with cryptography code a lot, and I completely agree here. I really don't care if I have to call an inline function named rotl() instead of having a custom operator to do it. It's very little inconvenience, and it ends up the same machine instruction anyway. It's better not having to deal with adding a new operator for something rather rare. (Whereas needing operator <=> is a lot more common than needing bit rotation.) Melissa -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/49ce026b-dafa-40e6-8ff9-c7a3fa1c8305%40isocpp.org. ------=_Part_26443_22813391.1511816380533 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Saturday, November 25, 2017 at 12:46:36 PM UTC-8, David= Brown wrote:
Rotations are rare - they only turn up in a few niche types of code, such as
cryptography algorithms. =C2=A0And usually such code is so complicated = and
requires such time and thought to understand, that any time spend
understanding a rotation operator or function is negligible.


I work with cryptography code a lot, a= nd I completely agree here.=C2=A0 I really don't care if I have to call= an inline function named rotl() instead of having a custom operator to do = it.=C2=A0 It's very little inconvenience, and it ends up the same machi= ne instruction anyway.=C2=A0 It's better not having to deal with adding= a new operator for something rather rare.=C2=A0 (Whereas needing operator = <=3D> is a lot more common than needing bit rotation.)
=
Melissa

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To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/49ce026b-dafa-40e6-8ff9-c7a3fa1c8305= %40isocpp.org.
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